On Sun, Feb 19, 2012 at 03:19:21PM -0500, Marcus D. Leech wrote:
So, on a related topic, how do commercial FM-MPX receivers maintain
proper balance between
L-R and L+R -- do they just have a gain control that they tweak at
the factory and glue in place?
If the gain balance is off,
On Sat, Jun 11, 2011 at 07:40:54PM +0300, Patrik Tast wrote:
Hi All,
As you all know, VCM is short for Variable Coded Modulation.
As I have read on your forum, the new DVBS-2 NOAAPORT transmission is
variable.
So far I have noted that users use 8PSK demodulation and FEC?.
FEC?, due to
On Mon, Oct 12, 2009 at 11:16:11AM +1300, Richard Clarke wrote:
Hi All,
I was wondering if anyone has had any issues with the interpretation of
shorts by the GNU Radio udp source function, when the shorts are
transmitted from a big endian based platform? In my situation I am
transmitting
On Fri, Sep 25, 2009 at 12:00:34AM +0400, Alexander Chemeris wrote:
Power will be taken from USRP 6V, clock output will be SMA to
connect to USRP directly. Frequency control will be accessible
over RS-232 (aka COM-port) with simple text-based protocol. We're
going to use ATMega for this.
On Sat, Apr 04, 2009 at 11:16:42PM +0500, Sajjad Sarwar wrote:
I am doing my UG project on optimized packet radio in SDR. Presently, I am
using costas loop block but i think it's recovering only the frequency of
local oscillator but not the phase. Please correct me if i am wrong. Now the
On Fri, Mar 21, 2008 at 04:23:00PM -0500, Rick Parrish wrote:
Jeff Brower wrote:
All the standardized codecs that I know of, both ones with IP rights
requirements and free ones, provide a reference design, typically
fixed-point C code plus test vectors. I wonder why DVSI has not done
the
On Wed, Mar 19, 2008 at 07:38:13PM -0500, Rick Parrish wrote:
Jeff Brower wrote:
If you're looking at low bitrate codecs for GNU radio, why use a
hardware (dongle)dependent solution? You might look at MELPe, which
provides 600, 1200, and 2400 bps,and can be implemented as a software
On Fri, Jan 11, 2008 at 06:46:46AM -0800, Johnathan Corgan wrote:
David I. Emery wrote:
A hack I have thought about adding to the USRP FPGA code (but not
implemented yet) would allow collection of the count in a
continuously rolling 64 MHz counter driven by the current 64 MHz
clock
On Thu, Jan 10, 2008 at 08:46:09AM -0600, LRK wrote:
While the 'right' fix would be to supply a stable frequency source to
the USRP, it would be difficult.
Not impossibly difficult... it would, however, have been nice to
have a VCXO option for the USRP-1 that would have allowed
On Mon, Nov 26, 2007 at 11:18:53AM -0700, Chuck Swiger wrote:
Quoting John Clark [EMAIL PROTECTED]:
John Gilmore schrieb:
I can already think of one use that others can make of your
transmitter. EFF and I are interested in measuring the DRM responses
I am interested in a dvb-s receiver,
On Tue, Aug 14, 2007 at 10:55:40AM -0400, Vijay Ramasami wrote:
Thanks for the information David. I will look up ITU-J.83B ...
Do you happen to have any captured QAM cable data (or any website that
lists the data) ? I wanted to see if I can put together a software
demod for digital cable ...
On Mon, Aug 13, 2007 at 10:52:54AM -0400, Vijay Ramasami wrote:
Hi,
I have a couple of questions:
1. Does the US digital cable system follow the DVB-C standard (or one
of its annexes) ? Is there any information (website) on the typical
symbol rates, bandwidths (I am guessing approx 6
On Tue, Feb 27, 2007 at 11:01:58PM -0800, Matt Ettus wrote:
(which makes me
curious, does anyone use non-differential 8PSK?).
Yes, satellites often do.
I might add that non differential PSK/QPSK has a theoretical
noise advantage if some mechanism exists to figure out the
On Sat, Oct 14, 2006 at 06:49:03AM -0700, Eric Blossom wrote:
The USRP could receive the raw signals for DVB-T in the 6 and 7 MHz wide
channel format. The 8 MHz wide version could be somewhat degraded
because of filter rolloff at the edges of the passband of the digital
downconverter in the
On Sat, Oct 14, 2006 at 02:06:01PM -0400, Robert McGwier wrote:
David I. Emery wrote:
This implies that the USRP with a 6 to 8 mhz bandwidth might be
able to successfully demodulate the SCPC DVB-S QPSK video transmissions
at symbol rates like 3.9876 megasymbols/sec (5.5 mbs
On Wed, Sep 13, 2006 at 10:05:56AM -0400, Marcus Leech wrote:
There are double pulses that I'm seeing, with variable timing between
the main pulse
and the sub-pulse. The other 1350Mhz radar is much further away from
me, but
perhaps the sub pulses I'm seeing are coming from the other radar
On Tue, Sep 12, 2006 at 08:01:51AM -0400, Marcus Leech wrote:
David I. Emery wrote:
The transponders are 1090/1030 mhz and not 1350. 1350 is just
radar.
There are double pulses that I'm seeing, with variable timing between
the main pulse
and the sub-pulse. The other 1350Mhz
On Mon, Sep 11, 2006 at 11:30:47PM -0500, Rick Parrish wrote:
*giggle*
Marcus ... that's an aircraft transponder. Except for some vintage
1930's aircraft that don't have an electrical system - every plane /
helicopter has one. Hit Google or Yahoo! for Mode-C and Mode-S
transponder.
On Fri, Jun 02, 2006 at 10:30:36AM -0700, Matt Ettus wrote:
Just read about MovieBeam on Slashdot. They mention that it
piggybacks on a PBS signal. I assume they mean a digital TV channel,
but they have a very small antenna.
While I have no specific inside information at the
On Sun, Mar 05, 2006 at 12:03:33PM -0800, Eric Blossom wrote:
Good question. I've wanted to revisit it myself too.
As I recall it was to reduce the spurs in the DDC output.
If you get a chance, please see if you can find relevant papers.
I suggest searching for DDS spurs, or something like
On Wed, Nov 30, 2005 at 05:12:11PM +1030, Daniel O'Connor wrote:
On Wed, 30 Nov 2005 16:33, Matt Ettus wrote:
A useful application would be to control a calibrated noise source and
measure the power in a given bandwidth with it on and off. This is how
a noise figure meter works.
Noise
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